Draw the graph, easier to know domain and range,
And remember, domain of f(x)= range of finverse(x)
Range of f(x) = Domain of finverse(x)
The function is defined for the domain , where a is a constant.
(i) Express in the form .
(ii) Find the smallest value of a for which has an inverse.
(iii) Find the domain of corresponding to this value of .
Is the domain and range ?